Every baby is an angel sent by God, parents should not compare their own children with other children, but if parents find that their children and children of the same age there is a big gap in growth and development, then parents should be alert to whether the child is slow to develop, there is no disease or other factors affected. 1, two months of children still can not smile Many children will be born to smile, in fact, that is not the child’s real emotional expression, but Xing is the natural phenomenon of facial muscles. Children really learn to laugh until after the child is full moon, when the child is really expressing their emotions, such as drinking Po milk, the child’s face will appear satisfied smile, which is the reason they feel very comfortable. If the child does not smile by two months, the child may have developmental delays, parents are advised to take the child to the relevant institutions for testing, whether the child has health or other problems. 2, three months of the child will not lift the head The child more than two months will naturally roll over and learn to lift the head, if the child to three months after they can not lift their own head, then the parents can not sit back and watch. They should immediately take the child to the hospital for examination, to do early detection, early treatment, infancy is the golden period of child development, as long as the problem can be detected early and find the problem, the treatment effect is still very good, some children because they missed the best treatment time, resulting in a very difficult to cure, the child’s future healthy life caused unnecessary harm. 3. At four months, the child will not let go of his fingers. At four months, the child’s fingers should be very flexible and free to hold loosely, and if they put their favorite toys or objects next to their little hands, they will naturally grab them with their hands. If the child is four months old, but their fingers are still tightly clenched into a fist, not naturally loose, and do not know how to use their fingers to grasp things, the child may really have slow development, parents should pay attention, rather than waiting for the flowers to bloom, the longer you wait, the more detrimental to the child’s healthy growth. 4, nine months of children can not crawl crawling is a necessary prerequisite for children to learn to stand and walk, a child who has not crawled to learn to walk and run is far more difficult than a child who has gone through crawling. If a child is still not crawling at around nine months of age, parents should take the child to the hospital for an examination to see what is causing the delay in crawling and whether it will affect the child’s future health development. Many parents tend to spend less time with their children because they are busy at work, and as a result, some of their children’s developmental delays are not detected in time, giving a boost to the child’s healthy growth and being unfair to the child.